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Astronomy

Alberto G Cruz

(extra Credit????)

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Across
1.the brightness of a star when viewed from earth
3.a body of rock and metal that are held together by frozen gasses orbiting the sun
7.moon moves directly between earth and the sun causing a shadow on the earth
9.the fuzzy, gaseous component of a comets head
10.describes the view that the sun is at the center of the solar system
12.a slow motion of earth’s axis that traces out a cone over a period of 26000 years
13.any earth like planets
15.a continuous spectrum produced when white light is passed though a cool gas under low pressure.
17.the point in the orbit of a planet where it is closest to the sun
20.The spectrum of bright lines, bands, or continuous radiation characteristic of and determined by a specific emitting substance
22.obvious change in Frequency sound waves caused by relative motions from the sources and observer.
24.Meteoroid that travels through earth and burns up
25.a plot of stars according to their absolute magnitudes and temperature
26.one of two stars revolving around a common center of mass under their mutual gravitational attraction
29.continuous light emitted by a solid liquid or gas under pressure
30.the distance light travels in a year
31.a law that states galaxies are retreating at a speed proportional to their distance
32.the place in the orbit of a planet where the planet is farthest from the sun
33.a group of stars dust and gasses held together by gravity
34.moon passes through earth’s shadow
Down
1.the apparent brightness of a star if it were viewed from a distance of 32.6 light-years
2.any portion of a meteoroid that reaches earth’s surface
4.the study of the properties of light that depend on wave length
5.the arrangement of electromagnetic radiation according to wave length
6.describes the concept of an earth-centered universe
8.a small solid partial that travels in space
11.AU
14.the apparent westward motion of the planets with respect to the stars
16.an oval
18.point at which the moon is farthest from the earth
19.lass massive nuclei combine with more massive nuclei creating bigger nuclei, creates massive amount of energy
21.low density, Huge Gas Giants
23.the point at which the moon is closest to earth
27.rock from space
28.the angle between two imaginary lines from two different observation points meeting at an astronomical object, used to measure the object's distance from Earth

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